EP0687504A1 - Procédé et dispositif pour la séparation d'acier inoxydable hors de matériau mixte - Google Patents

Procédé et dispositif pour la séparation d'acier inoxydable hors de matériau mixte Download PDF

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Publication number
EP0687504A1
EP0687504A1 EP95830244A EP95830244A EP0687504A1 EP 0687504 A1 EP0687504 A1 EP 0687504A1 EP 95830244 A EP95830244 A EP 95830244A EP 95830244 A EP95830244 A EP 95830244A EP 0687504 A1 EP0687504 A1 EP 0687504A1
Authority
EP
European Patent Office
Prior art keywords
stainless steel
magnets
roller
magnetic field
materials
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95830244A
Other languages
German (de)
English (en)
Inventor
Danilo Molteni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SGM SpA
Original Assignee
SGM SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SGM SpA filed Critical SGM SpA
Publication of EP0687504A1 publication Critical patent/EP0687504A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/035—Open gradient magnetic separators, i.e. separators in which the gap is unobstructed, characterised by the configuration of the gap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/22—Details of magnetic or electrostatic separation characterised by the magnetical field, special shape or generation

Definitions

  • the present invention relates to a process and a device for separating stainless steel from mixed materials containing it, and in particular a process and a device wherein stainless steel is separated from magnetically inert materials by means of magnetic attraction.
  • the volume may be considered as a constant, the only variable quantity is the gradient value dH/dx.
  • the present invention is based on the idea of highly increasing the magnetic potential gradient value dH/dx so that force F, in determinate areas of the resulting magnetic field, reaches values sufficient for attracting stainless steels having a low Bi index.
  • Such an object is achieved with a process wherein the mixed material free from ferromagnetic components is conveyed through a magnetic field whose magnetic potential gradient in the working area is higher than 1500 Oe/cm, with consequent attraction and stopping of stainless steel and its separation from the inert materials which keep on moving.
  • Another object of the present invention is to provide a device for practically performing the above process.
  • the magnetic field generator having a high magnetic potential gradient consists of a plurality of magnets arranged in parallel lines and rows wherein the polarities of the magnets are alternated in each line and in each row, every magnet having the open poles magnetically insulated from the others.
  • the generator produces a magnetic flux cross-over which can generate in the working area a very high magnetic potential gradient, anyway higher than 1500 Oe/cm as required from the process according to the present invention.
  • the plurality of magnets is arranged in parallel lines and rows on a flat surface.
  • the thus obtained flat generator is placed under a conveyor belt capable to carry the material to be processed.
  • a conveyor belt capable to carry the material to be processed.
  • the magnetic field generator consists of a roller whose cylindrical surface is provided with parallel lines and rows of magnets, which is used for driving the conveyor belt which carries the material to be processed.
  • This particular embodiment offers a high selectivity, as well as all the advantages connected to the magnetic separation technique.
  • the generator according to the present invention consists of a plurality of lines of permanent magnets 1 aligned on the cylindrical surface of a roller 2 provided with a shaft 3.
  • One end of shaft 3 is provided with a key 4 for keying a motor.
  • roller 2 is preferably used for driving the conveyor belt as it will be afterwards described in detail.
  • roller 2 may be also an idle or driven roller.
  • Magnets 1 are arranged in parallel lines 5, 5' ,5'' etc., circumferentially placed side by side on the outer surface of roller 2. Lines 5, 5', etc. are placed side by side so that magnets 1 are perfectly aligned so as to form also parallel rows 6, 6' and 6'' of permanent magnets 1 axially placed side by side.
  • FIG. 2 there is shown in detail how magnets 1 are arranged along their lines 5, 5' etc. and rows 6, 6', etc. Letters N and S point out the north and the south pole of each magnet 1 so that it is evident that all magnets 1 are arranged in such a way that their polarities are alternated along circumferential lines 5 as well as along axial rows 6, 6', etc.
  • Each magnet 1 is magnetically insulated from the neighboring ones. This can be easily carried out, for example, by leaving free gaps between the magnets so that each magnet is perimetrically in contact with air. However, in order to further strengthen the magnets as a whole, it is preferable to fill the gaps with a suitable insulating material, for instance an epoxidic resin.
  • a suitable insulating material for instance an epoxidic resin.
  • the resin casting besides strengthening the whole structure, also ensures that each magnet permanently stays in its seat without being moved even under high stresses.
  • roller 2 while being used as the driving roller of the conveyor belt, is subjected to high stresses during the working of the device according to the present invention.
  • the arrangement of the polarities of magnets 1, as shown in Fig. 2, is such that the plurality of magnets 1 causes that particular magnetic flux cross-over capable of generating in the working area a very high magnetic potential gradient, higher than 1500 Oe/cm, needed for carrying out the process of the present invention.
  • the magnets available now on the market it is possible to manufacture according to the present invention a device which is capable of generating in the working area a magnetic potential gradient higher than 4000 Oe/cm and even equal to 5000 Oe/cm.
  • Fig. 3 which shows a cross-sectional view of roller 2, there can be seen that the latter essentially consists of a hollow cylinder 7 made of ferromagnetic material, having each base closed by a flange 8 and provided with a shaft 3.
  • Cylinder 7 is made of ferromagnetic material, preferably mild steel which notoriously is the cheapest material having a high magnetic permeability.
  • the outer surface of cylinder 7 is shaped so as to form a plurality of rectangular seats 9 each of them is destined to hold a magnet 1.
  • each gap is preferably filled with an epoxidic resin.
  • jacket 11 made of a suitable material.
  • Stainless steel is a material suitable to this purpose, even if it negatively influences the magnetic field in the operative area.
  • jacket 11 may be made of glass reinforced resin.
  • Magnets 1 used in the embodiment here described and illustrated in the attached drawings are permanent magnets. It is obvious that they can be replaced by electromagnets, but this naturally involves manufacturing complications.
  • the apparatus comprises a vibrating table 12 where the mixed material 13 to be submitted to the stainless steel separation process is introduced.
  • Material 13 essentially made of stainless steel and inert materials, is transferred on conveyor belt 14 driven by roller 2 constructed as above described and illustrated in Figs. 1 to 3.
  • the motion is given by motor 15 on which the end of roller 2 is keyed.
  • Stainless steel fragments remain adherent to conveyor belt 14 even when they are below roller 2.
  • the detachment occurs only when the particles move away from roller 2 and the gravity force acting on such particles prevails on the magnetic attraction force generated by roller 2.
  • the detachment of such particles is indicated by arrow 18 in Fig. 4 which also shows how such particles are collected into hopper 19.
  • the stainless steel fragments from the point where they are stopped on the conveyor belt 14 up to the point where they leave such belt, do not move with respect to magnets 1 arranged on roller 2. Thanks to this arrangement the preferred embodiment of the separating device according to the present invention allows the best separation possible at the present time for stainless steels.
  • the treatment of mixed materials is thus highly selective so that the reclaimed stainless steels are substantially free from inert materials.
  • the present invention has been described referring to its applications to the treatment of mixed material for separating stainless steels. It is obvious that it can be also applied with success to the separation of other materials characterized by low Bi values of intrinsic magnetization, i.e. materials commonly considered paramagnetic or non-magnetic.

Landscapes

  • Manufacture And Refinement Of Metals (AREA)
  • Non-Mechanical Conveyors (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP95830244A 1994-06-14 1995-06-12 Procédé et dispositif pour la séparation d'acier inoxydable hors de matériau mixte Withdrawn EP0687504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI941234A IT1270218B (it) 1994-06-14 1994-06-14 Procedimento e dispositivo per la separazione di acciaio inox da materiali misti che lo contengono
ITMI941234 1994-06-14

Publications (1)

Publication Number Publication Date
EP0687504A1 true EP0687504A1 (fr) 1995-12-20

Family

ID=11369108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95830244A Withdrawn EP0687504A1 (fr) 1994-06-14 1995-06-12 Procédé et dispositif pour la séparation d'acier inoxydable hors de matériau mixte

Country Status (2)

Country Link
EP (1) EP0687504A1 (fr)
IT (1) IT1270218B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6415907B1 (en) 1997-08-22 2002-07-09 Rosebay Terrace Pty Ltd. Article transfer apparatus
CN103506218A (zh) * 2012-06-19 2014-01-15 宝山钢铁股份有限公司 矿料输送带长废钢去除方法
ITMI20121901A1 (it) * 2012-11-08 2014-05-09 Sgm Gantry Spa Tamburo per separatore magnetico e relativo metodo di produzione
WO2018009242A1 (fr) 2016-07-07 2018-01-11 Bunting Magnectics Company Rouleau magnétique
US11944980B2 (en) 2020-04-24 2024-04-02 Bunting Group, Inc. Magnetic separating conveyor output roll

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959288A (en) * 1958-03-28 1960-11-08 Infilco Inc Magnetic clarifier drum
FR2326979A1 (fr) * 1975-10-11 1977-05-06 Kloeckner Humboldt Deutz Ag Procede et dispositif pour separer des particules aimantables d'une matiere solide a grain fin en suspension dans un agent porteur au moyen d'un champ magnetique de separation fort
US4225047A (en) * 1979-05-30 1980-09-30 The Continental Group, Inc. Magnetic can separator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959288A (en) * 1958-03-28 1960-11-08 Infilco Inc Magnetic clarifier drum
FR2326979A1 (fr) * 1975-10-11 1977-05-06 Kloeckner Humboldt Deutz Ag Procede et dispositif pour separer des particules aimantables d'une matiere solide a grain fin en suspension dans un agent porteur au moyen d'un champ magnetique de separation fort
US4225047A (en) * 1979-05-30 1980-09-30 The Continental Group, Inc. Magnetic can separator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J.KOPP, IEEE TRANSACTIONS ON MAGNETICS, vol. 20, no. 5, NEW YORK US, pages 1204 - 1206 *
R.M.BOZORTH: "Ferromagnetism", VAN NOSTRAND COMP., NEW YORK US *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6415907B1 (en) 1997-08-22 2002-07-09 Rosebay Terrace Pty Ltd. Article transfer apparatus
CN103506218A (zh) * 2012-06-19 2014-01-15 宝山钢铁股份有限公司 矿料输送带长废钢去除方法
CN103506218B (zh) * 2012-06-19 2016-08-24 宝山钢铁股份有限公司 矿料输送带长废钢去除方法
US9375727B2 (en) 2012-11-08 2016-06-28 Sgm Gantry S.P.A. Drum for magnetic separator and relevant production method
CN104768652A (zh) * 2012-11-08 2015-07-08 Sgm台架股份公司 用于磁性分离器的鼓和相关生产方法
AU2013343103B2 (en) * 2012-11-08 2016-01-28 Sgm Gantry S.P.A. Drum for magnetic separator and relevant production method
WO2014072880A1 (fr) * 2012-11-08 2014-05-15 Sgm Gantry S.P.A. Tambour pour séparateur magnétique et procédé de production associé
ITMI20121901A1 (it) * 2012-11-08 2014-05-09 Sgm Gantry Spa Tamburo per separatore magnetico e relativo metodo di produzione
RU2626082C2 (ru) * 2012-11-08 2017-07-21 СГМ ГАНТРИ С.п.А. Барабан для магнитного сепаратора и способ его изготовления
WO2018009242A1 (fr) 2016-07-07 2018-01-11 Bunting Magnectics Company Rouleau magnétique
EP3307441A4 (fr) * 2016-07-07 2019-02-13 Bunting Magnetics Company Rouleau magnétique
US11944980B2 (en) 2020-04-24 2024-04-02 Bunting Group, Inc. Magnetic separating conveyor output roll
EP4132717A4 (fr) * 2020-04-24 2024-05-08 Bunting Magnetics Company Rouleau de sortie de transporteur de séparation magnétique

Also Published As

Publication number Publication date
ITMI941234A1 (it) 1995-12-14
IT1270218B (it) 1997-04-29
ITMI941234A0 (it) 1994-06-14

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